For an NRI to update the address, they need to contact their respective Delaer/Relationship Manager or Customer Service at service.securities@kotak.com.
The respective RM / Dealer / CS Executive will send a KYC updation form to the NRI client which the client needs to fill & attest the relevant documents and courier it Kotak HO.
(It is an offline process for NRIs and cannot be done on the KST App or Kotak Securities Website)